According to FISA, the U.S.attorney general can authorize emergency surveillance of a U.S. citizen for how long before obtaining a warrant?

Name: According to FISA, the U.S.attorney general can authorize emergency surveillance of a U.S. citizen for how long before obtaining a warrant?
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Under the Foreign Intelligence Surveillance Act (FISA), the U.S. Attorney General can authorize emergency electronic surveillance of a U.S. citizen for up to 7 days before needing to obtain a warrant.